Vet. Not just a regular vet, a herp vet. A cat/dog vet probably won't be able to handle this. The sugar treatment (sometimes I've seen honey recommended, though I've only had to use that one on the occasional frog) is okay, but if a prolapse happens more than once, it's still a good idea to get a vet to check it out IMO.
I'm not trying to be harsh, but when you're dealing with future issues, if you'd take your dog to the vet for something, take your snakes. You wouldn't let a dog go for two weeks with a segment of dried out lower intestine hanging out of it. I hate to be pessimistic, but waiting so long to treat this may have cost your snake its life, and definitely turned what could have been a quick fix into what will almost certainly be a costly ordeal...